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Abstract: OREA is the extension of a large underground sewer treatment plant (figure 1), owned by four municipalities outside Oslo. The purpose of OREA is treatment of excess flood water that today runs via a spillway directly out to the Nitelva river. The main rock cavern of OREA will be 60m long, 20m wide and 20-25m deep, rock quality variable and rock overburden shallow. The location is...